Zix - Office 365 Setup

This report covers the native integration method (ZixGateway with Office 365 connectors) and the recommended approach for automatic policy-based encryption. Date: [Current Date] Version: 1.0 Purpose: To document the architecture, prerequisites, configuration steps, and policy rules for integrating Zix Email Encryption (ZixProtect, ZixEncrypt, or ZixGateway) with Microsoft Office 365. 1. Executive Summary Zix encryption services integrate with Office 365 via SMTP. The recommended method for full Office 365 compatibility is to route outbound encrypted emails through the Zix Cloud or an on-premises Zix Gateway using Exchange Online Connectors . This setup ensures outbound emails requiring encryption are redirected to Zix for processing (TLS, Portal, or Secure Message Center) while inbound replies are routed back to Office 365 without disruption. 2. Prerequisites Before configuring the integration, ensure the following:

Reference: Microsoft 365 URLs and IP ranges zix office 365 setup

| Requirement | Detail | |-------------|--------| | | Any plan with Exchange Online (Business Standard, Premium, E3, E5) | | Zix Service | ZixProtect, ZixEncrypt, or ZixGateway (Cloud or On-Prem) | | Domains | Verified domain(s) in Office 365 and added to Zix console | | MX Record | Must point to Office 365 (e.g., yourdomain.mail.protection.outlook.com ) – Not to Zix. | | IP Allow/ACL | Zix publishes source IPs for outbound email; add these to Exchange Online connection filter. | 3. Architecture Overview The following diagram describes the logical mail flow: This report covers the native integration method (ZixGateway